We found this book at the Terrenate Ruins geocache. We will hold on to it for a while as we are new to Arizona, and live in Tucson with many wild animals visiting our property. Then we will release again. Great book for reference, there was even a lot of scat on the trail out to the ruins to identify!! We are also new to geocaching. Since you travel, you must have tons of geocaches under your belt. Thaks for sharing the book with us! We hope to find others!